（价格）随市价变动而变动。
我方的报盘自今日起一周内有效，以后可按每日市价变动／随行就市。
Our offer is valid for seven days from today, and will then be subject to change according to the market price of the day.
成本原则假设成本等于资产购置时的公平市价，因此，取得以后市价的变动对成本全无影响。
The cost principle is based on the assumption that cost is equal to fair market value at the date of acquisition and subsequent changes are not relevant to it.
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